Chosen Solution
Hello, I have read some other answers but I have not found what interests me. I’m considering purchasing a 2019 5k iMac which is provided to me by Apple as refurbished which has a 2TB Fusion Drive. I would like to remove the Fusion Drive and install 2 SSDs: The first by removing the mechanical disk and using a 1Tb Samsung Evo SSDThe second by removing the PCIe SSD (which I believe is 32Gb) with a 1Tb Samsung Evo SSD + Apple Adapter Once this is done I would like to install Mac OS X on the PCIe SSD disk and using a 50% of the SATA disk install Bootcamp with Windows 10. Is it possible to do this? Thanks in advance.
Sadly no, BootCamp needs to be part of the Boot drive in your case the PCIe/NVMe drive. While Windows needs to be loaded from that drive you can use your other drive (NTFS or exFAT volume) to hold your Windows apps and stuff. As far as using an adapter to support a M.2 SSD I really don’t recommend doing it. While it will appear to work just fine for awhile over time they breakdown as Apple has a few other lines to the SSD unit that these M.2 SSD’s don’t deal with. I’ve pulled out quite a few! With lots of folks crying between the cost ofd still doing it again and the loss of work! Best to stick with either the Apple custom SSD’s or use the OWC SSD which is designed to work from the ground up!
You can not install more that 32Gb of OS in your iMac because Apple limit the start disk firmware of upto 32Gb only, even you change the 32Gb SSD to a higher one it will not run the boot camp installation, I tried this and informed apple about the problem then apple answered was OS startup firmware is limit to upto 32Gb only.
